Fused cutout



Aug. 10, 1948. E; H. YoNKERs FUS ED CUTOUT Filed Dec. 30, 1944 Patented Aug. 10, 1948 UNITED STATES PATENT FUSED CUTOUT Edward H. Yonkers, Chicago, Ill., assigner to J oslyn Mfg. and Supply Co., Chicago, Ill., a corporation of Illinois Application December 30, 1944, Serial No. 570,526

(Cl. D-114) 16 Claims.

The present invention relates to fused cutouts, and has for one of its objects the provision of an improved cutout of the dropout type which is of simple and rugged construction, is thoroughly reliable in operation, and in which the fuse tube assembly may be easily and quickly mounted upon or detached from the spaced terminals of the insulator assembly.

It is another object of the present invention to provide an improved and simple mechanism of the collapsible hinge type for normally supporting the fuse tube and for permitting the fuse tube of the cutout to dropout when the fuse link is ruptured.

According to another object of the invention the fuse tube assembly of the cutout is provided with a fuse extracting member which is arranged to perform the additional function of holding the hinged parts of the fuse tube assembly against collapse so long as the fuse link within the fuse tube is not ruptured and for releasing the hinged parts for relative rotation to permit dropout movement of the fuse tube when fuse rupture occurs.

In accordance with still another object of the invention the fuse conductor extracting member is provided with a part which serves as a switch hook receiving loop and also acts to limit the movement of the extracting member during a fuse conductor extracting operation.

According to a further object of the invention, the coacting parts of the biasing and extracting means are so arranged that force is applied to the extracting member during substantially the full movement of this member to withdraw the fuse link conductor from the fuse tube.

According to still another object of the invention, the operation of the fuse extracting member to produce arc elongation and fuse conductor extraction upon fuse rupture is accomplished entirely independently of the dropout movement of the fuse tube assembly and at a high rate of speed such that it is completed during the initial dropout movement of the fuse tube assembly.

The invention, both as to its organization and method of operation, together with further ob- `iects and advantages thereof, will best be understood by reference to the following specification taken in connection with the accompanying drawings, in which:

Fig. 1 is a side view, partially in section, illustrating an improved cutout characterized by the features of the present invention;

Fig. 2 is a bottom. View of the cutout shown in Fig. 1.

Fig. 3 is an enlarged fragmentary sectional view taken along the lines 3 3 of Fig. 1.

Fig. i is a fragmentary sectional view of the fuse tube assembly illustrating the construction of the biasing assembly for the fuse extracting arm embodied therein:

Fig. 5 is an additional side view of the cutout illustrating the manner in which the parts of the fuse tube assembly change position in response to fuse rupture; and

Fig. 6 is a fragmentary view illustrating a modication of certain parts of the fuse tube assembly.

Referring now to the drawings, and more particularly to Fig, 1 thereof, the present improved fused cutout is there illustrated as comprising the usual insulating support in the form of a petticoat insulator Hl having a center zone longitudinally thereof clampingly embraced by a bracket II which may be utilized in supporting the cut-out upon a pole or another suitable supporting structure. At its respective upper and lower ends the insulating support Ill is provided with spaced apart upper and lower terminals indicated generally at I2 and i8, respectively, and between which a fuse tube assembly 24 of the expulsion type is adapted to be supported.

Specifically, the upper terminal I2 comprises a conductive channel member of U-shaped cross section throughout its length and having an integrally formed half collar I2a at one end thereof for embracing the collar seat provided at the upper end of the insulating support Ill. This portion of the terminal I2 is clamped against the seating surface of the support I by means of a half collar clamping member I3 and clamping screws I3a disposed upon opposite sides of the support IIJ.

At the laterally extended end thereof, the upper terminal member is provided with downwardly extending hood skirts I2c and I2d, the upper portions of which are arranged in meeting engagement with an overhanging lip I2e extending downwardly from the top part of the channel shaped terminal member I2. Thus, the parts I2C, I2d and I2e define a hooded or partially enclosed space at the extended end of the terminal member I2 for receiving therewithin the upper end of the fuse tube assembly 24, To prevent this end of the fuse tube assembly from being moved beyond a predetermined point longitudinally of .i the skirts I2C and I2d as the assembly is swung into its closed circuit position, a stop member I2b is connected transversely between the two identied skirts. This member, which may be formed integral with the skirts I2C and I2d, is arranged to coact with a leaf spring catch member I4 in retaining the upper end of the fuse tube assembly 24 against outwardly swinging movement to the open circuit position thereof. One end of the spring I4 is anchored to the under side of the upper terminal member by means of a terminal screw I5 which is threaded through a reinforced top side portion of the terminal member. A clamping washer Il and a nut I6 threaded on the screw I5 maybe utilized to establish line wire connections with the upper terminal member.

The detachable fuse tube assembly 24 comprises the usual expulsion fuse tube 25 formed of an inner layer of pressed fibre or the like, having good arc-extinguishing gas evolving properties, and an outer layer of Bakelite impregnated paper having excellentginsulating properties. At its upper end, this fuse tube is provided with a terminal ferrule 28 having a threaded end portion for receiving the internally threaded terminal cap 29. The two last-mentioned terminal parts are arranged to have the head 36a of a fuse link 36 clamped therebetween internally of the fuse tube 25. This link, which preferably is of the improved form disclosed and claimed in applicants copending application, Serial No. 533,824, iiled May 3, 1944, is provided with a pigtail conductor 3| extending longitudinally of the tube 25 and out of the open lower end of this tube.

The tube 25 is arranged to be supported by a laterally extending and conductive supporting arm 26 which is substantially square in cross section throughout the major portion of its length at its right end, this arm is pivotally connected with a metallic ferrule 2l through which the lower open end 25a is driven to provide a pressed t connection therebetween. More specically, the supporting arm 26 is at its right end hollowed internally along the line 26a to provide transversely spaced apart side parts 26h and 26e for receiving a radially extended locking part 21a of the ferrule 2l therebetween. A pivot pin 28 driven through registering openings in the side parts 26h and 26aand loosely received within an opening through the locking part 27a is utilized to provide the desired hinged connection between the ferrule ZI and the supporting arm 26.

Interengageable and complementary hinge parts respectively mounted upon the lower terminal I8 of the insulating support i6 and the extended end of the supporting arm 26 are provided for pivotally supporting the fuse tube assembly 24 upon the insulating support I6. Specifically, the lower terminal I8 is comprised of two half-cup parts Ia and I8?) which are screw clamped to embrace the lowermost petticoat of the insulator I6 The terminal part I8a carries a wire clamping assembly E60` for clamping a load conductor thereto. The terminal part |817 is provided with hinge means in the form of a -hook shaped bracket I9 having a pin receiving seat 2i formed therein. This bracket also includes a guide nose 26 which is utilized in the manner explained below to guide the hinge pin of the fuse tube assembly 24 into engagement with the seat 2|.

To coact with the bracket I6 in pivotally supporting the assembly 24 upon the insulating support I0, the supporting arm 26 is provided at its extended end with a forked portion comprising transversely spaced side parts 26d and 26e having a complementary hinge part in the form of a pivot rod 26j formed integral and connecting the side parts at their respective ends. The identified pivot rod is adapted for pivotal seating engagement with the seat 2I of the bracket I9, and is flattened along its length as indicated at 26g so that it will pass into the narrow mouth between the nose 26 and the surface 26a of the bracket I9 only when the supporting arm 26 is held in a position substantially normal to the illustrated position of the surface 26g.

For the purposes of normally locking the ferrule 2l and the supporting arm 26 against relative rotation, rapidly withdrawing the fuse link conductor or p,igtail 3l from the fuse tube 25 4 upon rupture of the fusible element of a link 36, and concurrently releasing the ferrule 2'I and the supporting arm 26 for relative rotation, there is provided a fuse extracting arm 32 which is pivotally supported upon the supporting arm 26 and 'is substantially coextensive in length therewith.

Throughout the major portion of its length this arm is disposed in a Achannel 26h formed at the underside of the supporting arm 26. Adjacent the end thereof which is removed from the ferrule 2l, the arm 32 is provided with a camming part 32a which extends angularly across a recess 26h formed at the underside of the arm 26. This ond of the arm 32 is extended upward from the upper surface Y,of the supporting arm 26 and is curved to form a partially closed loop 32d within which the hook of a switch stick may be inserted to facilitate mounting of the assembly 24 upon the terminals of the support I6. A pivot pin 33 extending transversely between the side parts 26e and 26d of the arm 26 is utilized pivotally to support the arm 32 upon the arm 26. The end 32e of the loopI 32d is adapted to engage the upper surface of the arm 26 and thus act as a stop for limiting pivotal swinging movement of the arm 3i away from the arm 26.

At its opposed swingable end, the arm 32 is provided with a centrally notched downwardly depending violin bridge 32e over which the pigtail conductor 3l or a fuse link 36 is adapted to be tensioned. Extending upwardly from this bridge is an end part 32h which is adapted to enter a, notch 2lb in the locking part 27a of the ferrule, thereby fixedly to interlock this ferrule and the supporting arm 26 against relative rotation. For the purpose of securing the pigtail conductor 3I` of a fuse link 36 to the arm 32, a screw 34 is threaded through the arm 32 to receive a wing nut 35 for clamping the conductor 3l against the arm 32.

In order to bias the arm 32 for pivotal movement away from the supporting arm 26, a spring biasing assembly is provided which comprises a compression spring 36 and a plunger 3l completely housed within the arm 26. Specifically. these parts telescoped one within the other in the manner illustrated are disposed within an elongated hole 2616 formed longitudinally of the arm 26. The plunger 3l is provided with a semispherical camming head 31a which is held in tensioned engagement with the camming part 32a of the arm 32 under the influence of the spring 36.

In order to provide for switch stick manipulation of the pivot rod 26 f into engagement with the trunnion seat 2| of the bracket I9, the extracting arm 26 is provided with the loop extension 32d in the manner explained above. To facilitate swinging of the fuse tube assembly into and out of' its closed circuit position the upper terminal member or ferrule 28 of this assembly is similarly provided with an enlarged and integrally formed loop 28h into which the hook of a switch stick may be readily inserted.

From the above explanation it will be `apparent. that when the fuse tube assemb-ly 24 is detached from the terminals of the insulating support i6, and it is desired to fuse the assembly 24, the terminal cap 29 is unscrewed from the ferrule 28 and a fuse link 36 inserted within the chamber of the tube 25 so that the pigtail conductor 3i thereof projects out of the open lower end 25a of the tube. Following this operation, and with the extracting arm 3-2 firmly held in the channeled underside of the supporting arm 26,

the projecting end of the conductor 3| is carried over the bridge portion 32o of this arm, tensioned around the screw 34 and clamped against the arm 32 by finger manipulation of the wing nut 35. Thus, the pigtail conductor serves tightly to hold the arm 32 in engagement with the underside of the supporting arm 26 against the bias of the spring 35 which reacts between the two arms through the plunger 31. With the two arms thus tied together, the end part 32b of thelarm 32 is held within the notch 21h of the locking part 21 positively to prevent relative rotation of the fuse tube 25 and the arm 26. In other words, the parts 25, 2B and 21 of the assembly are rigidly interlockecl to prevent relative movement between the terminal engaging ends of the assembly. After the described operations are completed, the terminal cap 29 may be threaded onto the ferrule 28 to clamp the head 30a of the fuse link tightly against the upper end of the ferrule.

In order to mount the fuse tube assembly 24 upon the terminals of the insulating support I-, the hook of a switch stick is rst inserted within the opening of the loop 32d to bring the shank portion of the hook into interlocked relationship with the loop'. In this regard it is noted that the switch hook opening within the loop 32d is positioned along the supporting arm 26 adjacent the extended end thereof so that as the switch hook is elevated to raise the assembly 24, the center of gravity of the assembly is well below the hook, thus providing for maintenance of the interlocked connection between the hook and the loop opening, and for easy manipulation of the pivot rod 26f into engagement with the bracket I9. As this rod is manipulated to bring it into engagement with the bracket I9, the'atted side 26g thereof is rst engaged with the guide nose 20 of the bracket. After such engagement, the rod 26,* may be easily slid down the nose 20 until it is fully seated within the seat 2|.

After the assembly 24 is thus pivotally mounted upon the lower terminal I8 of the insulating support l0, the hook of the switch stick may be withdrawn from the opening within the loop 32d and inserted into the opening of the loop 28h for the purpose of rotating the assembly 24 about the rod 26j into its closed circuit position. As the fuse tube assembly 24 is rotated in a counter clockwise direction to its closed circuit position, the flatted side 26g is rotated to face the narrow mouth leading to the seat 2|. The increased dimension of this rod thus presented to the restricted opening into the seat 2| positively interlocks the two parts 26f and I9 to prevent inadvertent removal of the assembly 24 from the terminal I8. During the final pivotal movement of the assembly into its closed circuit position, the terminal cap 29 is moved between the skirts I2C and I2d to engage the catch portion |4a of the spring i4, and rides beneath this portion of the spring until it is brought to bear against the stop part |217. As the nal movement of the terminal cap 29 toward the stop part |2b is completed, the catch portion |4a of the spring I4 rides over the edge of the cap 29, thereby firmly to hold the upper end of the fuse tube assembly against rotation away from the closed circuit position thereof. The spring I4 now exerts a thrust axially along the tube 25 which serves to enhance the contact pressure between the engaged hinge parts 261c and I9 as well as between itself and the cap 29. Thus, the fuse tube assembly 24 is iixedly mounted upon the insulating supportv Il) to provide a fused current path between the two terminals I2 and I8. Specifically, this path extends from the terminal screw I5 through the terminal I2 and the spring I4 to the terminal cap 29. From this point, the conductive path extends through the fusible element of the link 30 by way of the flexible pigtail conductor 3|, the extracting arm 32, the conductive arm 26, and the hinge parts 26j and I9 to the conductive terminal parts |3a and I8b. It will be noted that the springs I4 and 36 serve to hold all contacting parts of the fuse tube assembly and insulator terminals in pressure engagement, thereby to minimize contact resistance therebetween.

So long as current flow over the described conductive path between the terminals I2 and I8 does not exceed the current-time fusing characteristic of the link 30, the fusible element within this link serves mechanically to hold the extracting arm 32 in its set position against the underside of the supporting arm 26. When, however, this fusible element is required to carry current in excess of a predetermined magnitude for more than a predetermined interval, it is ruptured to relieve the holding force imposed upon the extracting arm 32 through the pigtail 3|. The spring 36, in reacting between the arm 26 and the camming part 32a of the arm 32 through the plunger 31 is thus rendered operative rapidly to rotate the arm 32 downwardly about the pivot pin '33, thereby to withdraw the pigtail conductor 3| from the lower end of the fuse tube 25. In this regard it is noted that the arm 32 is of substantial length, such that rotation thereof through a relatively small angle produces a relatively large displacement between the bridge end 32o thereof and the lower end of the tube 25. Further, this arm is of small mass and hence has little inertia, and is driven by the spring 36 through the plunger 31 throughout its entire stroke. Thus rapid acceleration of the bridge end 32o thereof away from the lower end of the fuse tube 25 is insured. In fact, the arm 32 and the spring 36 are preferably so designed that the arc is sufficiently elongated during the first voltage half cycle following fuse rupture to prevent breakdown of the gap during the next succeeding voltage hal-f cycle. Further, the length of the extracting arm 32 and the angle of movement of the bridge end 32e thereof is such that, under any and all conditions of fuse rupture, all of the pigtail conductor 3| and the lower unfused segment of the fuse link are completely removed at high speed from the bore of the fuse tube 25 to hang downwardly away from the insulating support I0. This arrangement is to be distinguished from conventional dropout cutouts wherein only partial pigtail conductor extraction is produced incident to fuse rupture. After the arm 32 has been rotated to a position substantially normal to the supporting arm 26, the end 32e of the arm 32 engages the upper surface of the arm 26 to arrest further rotation of the arm 3.2.

During the initial pivotal movement of the arm 32 away from the arm 26, the end part 32h thereof is withdrawn from the slot 21h, thereby to break the interlocking connection between the arm 26 and the ferrule 21 and thus release these parts for relative rotation. When the hinged connection between the arm 26 and the ferrule 21, the force exerted by the spring I4 axially of the tube 25 and gravitational pull upon the entire assembly 24 combine to move the parts of this assembly downward. Initially, the tube 25 is 'moved substantally longitudinally thereof until the cap 2-9 is disengaged from the spring I4, such movement being permitted by the co1- lapse of the double hinged connection between the tube 25 and the lower Iterminal I8. After the cap 29 is disengaged froml the spring I4 and the parts of the lassembly assume the approximate positions illustrated in full lines in Fig-5 of the drawings, the lentire assembly is free to swing downward about the axis of the pin 26j under the influence of gravity until it occupies -the lowermost dash-line position illustrated in Fig. 5 of the drawings. In this regard it is pointed out above that the action of the arm 32 to elongate the arc within the tube 25 and to withdraw the conductor 3| is very fast. Movement of the assembly 2li to its dropout position, on the other hand, proceeds relatively slowly due to the inerti-a of the parts making up the assembly. Thus the arrangement is such that complete are extinction is obtained independently of the dropout movement of the assembly and before the fuse tube cap 29 is disengaged from the spring I4, thereby to prevent are drawing between the two last-named terminal parts. More specically, the terminal spring Id tends to follow and hold its eng-agement with the terminal cap 2i9 during the initial dropout motion of the tube 25, and the arm 32 is moved with suilcient` rapidity under the inuence of the spring 36 completely to Withdraw the pi'gtail conductor 3I from the tube 25 before the cap 29 is disengaged from the terminal spring I4 after the dropout movement of the assembly 24 is completed, the terminals I2 :and I8 are obviously isolated by the insulator I to prevent leakage current iiow therebetween. By reengaging the hook of a switch stick with the loop 32d, the assembly may now be manually disengaged Vfrom the terminal I8 for refusing.

From the above explanation it will be apparent that substantially all operating parts of the cutout are protected against icing which might interfere with the operation of the cutout. Thus the upper end of the fuse tube assembly is substantially enclosed by the skirts I2c and I2d and the overhanging lips |126. Further, the biasing mechanism comprising the plunger 31 and the spring 38 is completely housed within the arm 26, and the arm 32 is covered throughout the major portion of its length by the arm 26. If it is desired to employ the arm 26 in completely covering the arm 32, the arrangement shown in Fig. 6 may be employed. As there shown, the loop 32d is formed integral with the upper wall of the arm 26, the extracting arm 32 is pivoted at its end upon the pivot pin 33, and the upper wall of the arm 26 is extended to cover the pivot pin and the pivoted end of the arm 32.

While there have been described what are at present considered to be the preferred embodiments of the invention,.it will be understood that various modications may be made therein which are within the true spirit and scope of the Iinvention as defined in the appended claims.

I claim:

l. A fuse tube assembly for a fused cutout, comprising a fuse tube provided with an open end, a supporting arm pivotally mounted upon said tube adjacent said open end, a fuse extracting arm pivotally mounted upon said supporting arm at a point removed from the open end of said tube and provided with a part for interlocking said tube and supporting arm against relative rotation, means for connecting a fuse link conductor projecting from the open end of said tube to said extracting arm, thereby to hold said extracting arm in a position where said supporting arm and tube Aare interlocked, and spring means biasing said extracting arm for movement -away from the open end of said tube, thereby to extract the connected conductor upon fuse rupture and to release said tube and supporting arm for relative rotation.

2. A fuse tube assembly for a fused cutout, comprising a fuse tube provided with an open end, a supporting amm pivotally mounted at one end upon said tube adjacent said open end, and means including a fuse extracting arm pivotally mounted upon said supporting arm for normally locking said tube and said supporting arm against relative rotation at a point adjacent said one end of said tube and for releasing the named parts for relative rotation incident to fuse rupture Within said tube.

`3. A fuse tube assembly for a fused cutout, comprising a fuse tube provided with an open end, a supporting arm pivotally mounted at one end upon said tube adjacent said open end and provided at its other end with means for pivotally supporting the assembly upon a stationary terminal, a fuse extracting arm pivotally supported upon said supporting arm adjacent said other end thereof and provided with a part for interlocking said tube and supporting arm against relative rotation, means for connecting a fuse conductor to said extracting arm, thereby to hold said extracting arm in a posi-tion where said supporting arm and tube are interlocked, and spring means biasing said extracting arm for movement away from the open end of said tube, thereby to extract the connected conductor from said tube upon fuse rupture and to release said tube and supporting arm for relative rotation.

4. A collapsible mounting assembly for supporting and permitting dropout motion of an expulsion fuse tube, comprising a ferrule adapted to receive an open end of a fuse tube therewithin and provided with a radially extending locking part, an elongated arm pivotally mounted at one end upon said ferrule and provided at its other end with a hinge part adapted for pivotal engagement with a complementary stationl ary hinge part, an elongated fuse extracting arm pivotally mounted upon said supporting arm adjacentsaid other end of said supporting arm and provided with a swingable end part engageable with said locking part to restrain said ferrule and supporting arm against relative rotation, means for connecting to said extracting arm a fuse conductor extending from the open end of the fuse tube, thereby normally to hold said extracting arm in a position where said end and locking parts are engaged, and means for biasing said extracting arm for movement of said end part out of engagement with said locking part and away from the open end of said tube, thereby to extract the connected fuse conductor from the tube upon fuse rupture and to release said ferrule and supporting arm for relative rotation.

5. A collapsible mounting assembly for supporting and permitting dropout motion of an expulsion fuse tube, comprising a ferrule adapted to receive an open end of a fuse tube therewithin and provided with a radially extending locking part, an elongated arm pivotally mounted at one end upon said ferrule and provided at its other end with a hinge part adapted for pivotal engagement with a complementary statlonary hinge part, an elongated fuse extracting arm pivotally mounted upon said supporting arm adjacent said other end of said supporting arm Y and provided with a swingable end part engageable with said locking part to restrain said ferrule and supporting arm against relative rotation, means for connecting to said extracting arm a fuse conductor extending from the open end of the fuse tube, thereby normally to hold said extracting arm in a position where said end and locking parts are engaged, said supporting arm having an elongated hole extending longitudinally thereof, and a spring actuated biasing assembly mounted within said hole and including a plunger engageable with said extracting arm to bias said extracting arm for movement of said end part out of engagement with said locking part and away from the open end of said tube, thereby to extract the connected fuse conductor from the tube upon fuse rupture and to release said ferrule and supporting arm for relative rotation.

6. A collapsible mounting assembly for supporting and permitting dropout motion of an expulsion fuse tube, comprising a ferrule adapted to receive an open end of a fuse tube therewithin and provided with a radially extending locking part, an elongated arm pivotally mounted at one end upon said ferrule and provided with transversely spaced apart side parts at its other end, a hinge part extending transversely between said side parts and adapted for pivotal engagement with a complementary stationary hinge part, an elongated fuse extracting arm including a camming part extending between said side parts and provided with a swingable end part engageable with said locking part to restrain said ferrule and supporting arm against relative rotation, means pivotally mounting said extracting arm upon said supporting arm, means for connecting to said extracting arm a fuse conductor extending from the open end of said fuse tube, thereby normally to hold said extracting arm in a position where said end and locking parts are engaged, and a spring actuated biasing assembly carried by said supporting arm and including a plunger engageable with the camming part of said extracting arm to bias said extracting arm for movement of said end part out of engagement with said locking part and away from the open end of said tube, thereby to extract the connected fuse conductor from the tube upon fuse rupture and to release said ferrule and supporting arm for relative rotation.

7. A collapsible mounting assembly for supporting and permitting dropout motion of an expulsion fuse tube, comprising a ierrule adapted to receive an open end of a fuse tube therewithin and provided with a radially extending locking part, an elongated arm pivotally mounted at one end upon said ferrule and provided with transversely spaced apart side parts at its other end, a hinge part extending transversely between said side parts and adapted for pivotal engagement with a complementary stationary hinge part, an elongated fuse extracting arm including a camining part extending between said side parts and provided with a swingable end part engageable with said locking part to restrain said ferrule and supporting arm against relative rotation, means pivotally mounting said extracting arm upon said supporting arm, means for connecting to said extracting arm a fuse conductor extending from the open end of said fuse tube, thereby normally to hold said extracting arm in a position where said end and locking parts are engaged, said supporting arm having an elongated hole extending longitudinally thereof, and a spring actuated biasing assembly mounted within said hole and including a plunger engageable with the camming part of said extracting arm to bias said extracting arm for movement of said end part out oi engagement with said locking part and away from the open end of said tube, thereby to extract the connected fuse conductor from the tube upon fuse rupture and to release said ferrule and supporting arm for relative rotation.

8. A collapsible mounting assembly for supporting and permitting dropout motion of an expulsion fuse tube, comprising a ferrule adapted to receive an open end of a fuse tube therewithin and provided with a radially extending locking part, an elongated arm pivotally mounted at one end upon said ferrule and provided with transversely spaced apart side parts at its other end, a hinge part extending transversely between said side parts and adapted for pivotal engagement with a complementary stationary hinge part, an elongated fuse extracting arm including a camining part extending between said side parts and provided with a swingable end part engageable with said locking part to restrain said ferrule and supporting arm against relative rotation, ineans pivotally mounting said extracting arm upon said supporting arm, means for connecting to said extracting arm a fuse conductor extending from the open end of said fuse tube, thereby normally to hold said extracting arm in a position where said end and locking parts are engaged, a spring actuated biasing assembly carried by said supporting arm and including a plunger engageable with the camming part of said extracting arm to bias said extracting arm -for movement of said end part out of engagement with said locking part and away from the open end of said tube, thereby to extract the connected fuse conductor from the tube upon fuse rupture and to release said ierrule and supporting arm for relative rotation, said extracting arm having an opposite end part forming a partially closed loop for receiving the hook oi a switch stick and engageable with said supporting arm to limit rotary movement oi said extracting arm by said plunger.

9. A collapsible mounting assembly for supporting and permitting dropout motion oi an expulsion fuse tube, comprising a ferrule adapted to receive an open end of a fuse tube therewithin and provided with a radially extending locking par", an elongated arm pivotally mounted at one end upon said ferrule and provided with transversely spaced apart side parts at its other end, a hinge part extending transversely between said side parts and adapted for pivotal engagement with a complementary stationary hinge part, an elongated fuse extracting arm including a camiing part extending between said side parts and provided with a swingable end part engageable with said locking part to restrain said ferruls and supporting arm against relative rotation, means pivotally mounting said extracting arm upon said supporting arm, means for connecting to said extracting arm a fuse conductor extending from the open end oi said fuse tube, thereby normally to hold said extracting arm in a position where said end and locking parts are engaged, said supporting arm having an elongated hole extending longitudinally thereof, a spring actuated biasing assembly mounted within said hole and including a plunger engageable with the camming part of said extracting arm to bias said extracting arm for movement of said end part out of engagement1 with said locking part and away from the open end of said tube, thereby to extract the connected fuse conductor from the tube upon fuse rupture and to release said ferrule and supporting arm for relative rotation, said extracting arm including an opposite end part forming a partially closed loop for receiving the hook lof a switch stick and having an end engageable with said supporting arm to limit rotary movement of said extracting arm by said plunger.

10. In a fused cutout which includes an insulating support, spaced terminals mounted upon said support and a fuse tube assembly mounted upon said support electrically to interconnect said terminals, a spring biased fuse extracting member included in said assembly and movable to extract a fuse conductor from the fuse tube of said assembly when a fuse housed within the tube is ruptured, said extracting member having a part forming a loop for receiving the hook of a switch stick and engageable with a part of said assembly to limit the movement of said member.

11. A fuse tube assembly adapted for detachable connection with a pair of terminals, comprising a fuse tube having an open end from which an extractable fuse conductor is adapted to project, a supporting arm extending laterally away from the open end of said tube, a fuse extracting arm pivotally supported upon said supporting arm for connection with the projected end of a fuse conductor, and biasing means for rotating said extracting arm away from the open end of said tube incident to fuse rupture, thereby to extract the connected fuse conductor from said tube, said extracting arm including an end part forming a partially closed loop for receiving the hook of a switch stick and having an end engageable with said supporting arm to limit the rotary movement of said extracting arm under the influence of said biasing means.

12. A collapsible mounting assembly for supporting and permitting dropout motion of an expulsion fuse tube, comprising a pair of hinged members, one of which is adapted to mount the fuse tube and the other of which is adapted pivotally to support the assembly and tube upon a stationary terminal support, and means including a spring biased fuse extracting arm pivotally supported upon one of said members lockingly to engage the other member at a point adjacent said fuse tube for normally restraining said pair of members against relative rotation.

13. A fused cutout comprising insulating supporting means provided with spaced terminal members, a fuse tube provided with an open end, a supporting arm pivotally mounted at one end upon said tube adjacent the open end thereof and hingedly engageable with one of said terminal members at the opposite end thereof to provide for swinging movement of the opposite tube end toward and away from said other terminal member, a fuse extracting arm pivotally mounted upon said supporting arm and provided with means for normally locking said tube and said supporting arm against relative rotation, and spring means biasing said extracting arm for movement away porting means provided with spaced terminal members, a fuse tube provided with an open'end, a supporting arm pivotally mountedy at one end upon said tube adjacent the open end thereof Cil from said supporting arm, thereby to e'ect fuse 70 conductor extraction and to release said tube and supporting arm for relative rotation incident to fuse rupture within said tube.

14. A fused cutout comprising insulating s up and hingedly engageable with one of said terminal members at the opposite end thereof to provide for swinging movement of the opposite tube and toward and away from said other terminal member, a fuse extracting arm pivotally mounted upon said supporting arm adjacent said other end thereof and provided with a part for interlocking said tube and supporting arm against relative rotation, means for connecting a fuse conductor to said extracting arm, thereby to hold said extracting arm in a position such that said extracting arm and tube are interlocked, and spring means biasing said extracting arm for movement away from said supporting arm, thereby to extract the connected conductor from said tube upon fuse rupture and to release said tube and supporting arm for relative rotation.

15. A fused cutout comprising insulating supporting means provided with spaced terminal members, a fuse tube provided with an open end, connecting means connected to said tube adjacent said open end and including a locking part, an elongated arm pivotally mounted at one end upon said connecting means and hingedly engageable with one of said terminal members at the opposite end thereof to provide for swinging movement of the opposite tube end toward and away from the other terminal member, a second arm pivotally mounted upon said elongated arm and provided with a swingable latching part engageable with said locking part to restrain said connecting means and elongated arm against relative rotation, fuse controlled means for normally holding said second arm in a position where said latching and locking parts are engaged, and means for biasing said second arm for movementof said latching part out of engagement with said locking part and away from the open end of said tube, thereby to release said connecting means and supporting arm for relative rotation upon fuse rupture.

16. A fused cutout comprising insulating supporting means provided with spaced terminal members, a fuse tube provided with an open end, a supporting member pivotally connected with said tube adjacent the open end thereof and hingedly engageable with one of said terminals to provide for swinging movement of the opposite tube end toward and away from said other terminal member, fuse extracting means pivotally mounted upon said supporting member and pr0 vided with a part for normally locking said tube and supporting member against relative rotation, and means biasing said extracting means for movement away from said supporting member, thereby to effect fuse conductor extraction and to release said tube and supporting member for relative rotation.

EDWARD H. YONKERS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,081,623 Fox May 25, 1937 2,212,633 Bodendieck Aug. 27, 1940 2,324,114 Schultz et al July 13, 1943 

